4s to 5s sim card.????

hello to all
this might be a dumb question. but need to be sure before i make the buy.
my 4s is on metropcs. i have a chance to buy a 5s for a good price it is from t-mobile been they are the same company can i just take my sim card and put it on the t-mobile 5s.??and no the 5s is not unlocked. but could it still work thanks

The SIM card size for a 4S is a micro sim and the 5S uses a nano sim. So it won't fit. You can just ask someone at a carrier store to activate a nano sim for you, or just purchase a SIM card cutter from someplace like eBay.